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Proceedings Paper

Modification of solidification conditions through the application of pulsed Nd:YAG lasers
Author(s): Jean Pierre Bergmann; Ronald Holtz; Johannes Wilden
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Paper Abstract

Welding and joining of different metallic materials such as steel, aluminum and titanium represents an increasing challenge for welding specialists, as intermetallic brittle phases form in the molten bath and grow to a connected chain during solidification. The brittleness of these phases leads to cracking and reduces the quality of the weld. One solution to avoid the negative effects of extended intermetallic phases is to directly and actively modify the motion behavior of the melt pool, in order to have intermetallics be broken up by the strong convection and attain a homogeneous and fine distribution in the solidified pool. Recent developments in laser technology allow for time dependent modulation of the laser power, so that Marangoni convection can be influenced as well. The basic effects of pulse shaping are presented in this paper for different material combinations.

Paper Details

Date Published: 26 April 2007
PDF: 10 pages
Proc. SPIE 6346, XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers, 634612 (26 April 2007); doi: 10.1117/12.738123
Show Author Affiliations
Jean Pierre Bergmann, Technical Univ. Ilmenau (Germany)
Ronald Holtz, LASAG AG (Switzerland)
Johannes Wilden, Technical Univ. Ilmenau (Germany)

Published in SPIE Proceedings Vol. 6346:
XVI International Symposium on Gas Flow, Chemical Lasers, and High-Power Lasers
Dieter Schuöcker, Editor(s)

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